To prevent the dropping-in of connectors between an inner panel and an outer panel, and eliminate the fear of interference of the connectors with other members and the like, in the assembly process of a vehicle.

The first opening 6 and the second opening 7 are formed on an inner panel 2 and an outer panel 3 respectively, and a bridging member 8 extending from the inner panel 2 to the outer panel 3 is provided. The first wire harness 4 is fixed to the bridging member 8, the first wire harness 4 is inserted in the first opening 6 and the second opening 7, and after wiring the first wire harness 4 along the bridging member 8, it is fixed, and the first wire harness side connector 14 and the second wire harness side connector 15 are combined on the outside of the outer panel 3.